The invention discloses a simple ultra-deep groundwater extraction device, and belongs to the field of groundwater extraction. The simple ultra-deep groundwater extraction device comprises main components such as a well pipe, an air pressing bag, an air supply pipe and the like, wherein the lower end of the air supply pipe is inserted into the well pipe, the upper end of the air supply pipe is connected with the air pressing bag, water stop valves are correspondingly arranged at the upper end of a water permeation hole of the well pipe and the lower end of the air supply pipe, and an air stopvalve is arranged at the upper end of the air supply pipe. According to the simple ultra-deep groundwater extraction device, the air pressing bag is compressed in a reciprocating mode so that air cancontinuously enter the well pipe, a water column in the well pipe is lifted out of the ground through the compressed air in the well pipe to flow out of a water outlet, and then the effect of extracting ultra-deep groundwater is achieved; and the device can effectively solve the problem that the water taking depth in water extraction by using a simple water pressing well and a centrifugal pump islimited by the atmospheric pressure.